Ok quiz. Wasn't hard. You could have put something better for Demeter. Janus was not Greek. It seems like you got a lot of this from Percy Jackson. I'm not sure if it's just another version of the myth, but Echo didn't "love the sound of her own voice." The gods of dreams were the Oneiroi. Morpheus was one of them. We also know Phobetor (aka Icelus) and Phantasus as some of the Oneiroi.
A lot of the so called 'gods' in this quiz are actually titans, and chaos is a whole other being. So please change the title to, Greek Gods and Titans.